Abstract
Brick masonry vaults for the approach structures of the Brooklyn Bridge were instrumented for remote monitoring. The objective of the project was to monitor and quantify safety of the structure, because of the longitudinal cracks at the crown of the double span vaults. A fiber optic sensor system was installed in the Brooklyn Bridge to monitor the crack opening displacements, wall rotations, temperature fluctuations, and vibrations. To quantify safety, a scaled model of the masonry vault was also tested in the laboratory in order to determine the failure crack opening displacement limits of the vaulted structure. Fiber optic crack sensors were mounted on the test vault to record the crack opening displacements under a range of base movements. Correlation of the in-service and failure crack opening displacements from the field measurements and laboratory tests provided the basis for the quantification of safety. This article provides a synopsis of activities to achieve these goals in terms of monitoring plans, instrumentation, and analysis of remote field data, laboratory experimental results and formulation of the safety assessment strategies.
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